Android 讀取本地Word/Pdf/Txt文件轉文本輸出

毫無疑問支持.doc和.docx的只有POI
好多jar都是積分下載，要麼就是官網下載，真心垃圾，jar包免費下載:
鏈接：https://pan.baidu.com/s/14MWWHN3cTsr0mmxMGkIObQ
提取碼：93ob
複製這段內容後打開百度網盤手機App，操作更方便哦

新增支持讀取txt文本和pdf,pdf需要iTextpdf.jar包，從上方鏈接下載即可

    /**
     * 讀取txt文件
     *
     * @param filepath 本地txt或log文件
     * @return 返回讀取到的文件內容
     */
    public static String readFileContent(String filepath) {
        String content = "";
        try {
            InputStream is = new FileInputStream(new File(filepath));
            InputStreamReader reader = new InputStreamReader(is);
            BufferedReader bufferedReader = new BufferedReader(reader);
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                content = content + line + "\n";
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NullPointerException e) {
            e.toString();
        }
        return content;
    }

    /**
     * 讀取word內容
     *
     * @param path
     */
    public static String readDoc(String path) {
        String content = "";
        try {
            FileInputStream in = new FileInputStream(path);
            //PoiFs 主要類 管理整個文件系統生命週期
            POIFSFileSystem pfs = new POIFSFileSystem(in);
            //獲取文檔所有的數據結構 可以說是一個“文檔對象”
            HWPFDocument hwpf = new HWPFDocument(pfs);
            content = hwpf.getText().toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return content;
    }

    /**
     * 讀取word內容
     *
     * @param path
     */
    public static String readDocx(String path) {
        String content = "";
        try {
            InputStream is = new FileInputStream(path);
            XWPFDocument doc = new XWPFDocument(is);
            XWPFWordExtractor extractor = new XWPFWordExtractor(doc);
            content = extractor.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return content;
    }

    /**
     * 讀取Pdf文件的內容
     *
     * @param path :文件地址
     */
    public String readPdf(String path) {
        String content = "";
        try {
            PdfReader pr = new PdfReader(path);
            int page = pr.getNumberOfPages();
            for (int i = 1; i < page + 1; i++) {
                content += PdfTextExtractor.getTextFromPage(pr, i);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return content;
    }